If setav sneak 98 didn't solve the problem, maybe setav sneak 100 could avoid the problem at all. I mean, maybe what trigger this is your skill reaching to 100 not your skill being at 100

After playing some more, my sneaking is still working fine, but the Sneak-Eye is totally bugged. It just randomly shows "Detected" and "Hidden" sometimes around enemies, even when the enemies actually act differently...

I also noticed that the Dwemer Centurions are not attacking me at all on sight, they only do when i click E on them or attack them first... Maybe it should be like that in Blackreach, but i'm not sure...

ive had the same problem where the centurions wont even attack, ive even summoned an extremely weak minion to attack it and it still refused to attack. same thing with other areas where i would wake the centurion in a crowded area full of falmer and the falmer would tear it to pieces while the centurion would just sit there gawking

I'm really hoping it doesn't break at 100... as the current rate my sneak keeps rising...... i'll be 100 in a few more hours.....

i can deal massive damage with sneak....

I wonder if hitting 100 makes it so you need to use the shadow warrior perk?

Kinda seems like things can detect you farther way than before so it is kind of a way to make you use the kinda useless perk, considering you can just run away and hide and eventually the enemies just go back to doing what they were doing.

Like I said before it seems to work sometimes and not at other times. Never constant.

I don't really understand this... Sometimes my sneak-eye works right, then sometimes it's totally bugged and doesn't show what it should...

Having 100 skill vs 98 shouldn't effect this unless is its another 1.2 bug that has broken it. Skills were made to exceed 100 with potions enchanting stackables. It should not loop back to lower number when above it.
I know as i'm playing in 1.1 atm with steam offline my sneak at 100 is working just fine.

Is stealth still broken at 100 after 1.3 ?

Yes...yes it is. My Nord Vampire (25% sneak bonus) with 100 Sneak gets detected ALL THE TIME outdoors. In doors it seems to work, for the most part. I can't sneak up on anything outside though, even at night in shadows! Because I am a light armor wearer with one-handed this gets me insta-killed by some things before I can close the distance. This thoroughly stinks.